Control box for audio system



FIG. 1 is a front perspective view of a control box for audio system showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines in the figures show portions of the control box for audio system which form no part of the claimed design. 

CLAIM We claim the ornamental design for a control box for audio system, as shown and described. 